通道过滤器：过滤器是通道中执行某种类型操作的透明的截取消息的组件，例如记录日志、转换、上下文处理等等。
Channel filters: filters are components that transparently intercept messages in channels to perform some kind of operation, such as logging, transformation, context manipulation, and so on.
截取程序要依照一组语法模式和用xml定义的过滤器来应用。
Interceptors are applied in accordance with a set of syntactical patterns and filters defined in the XML.
清单5 . servlet过滤器截取程序方法。
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